CN203278879U

CN203278879U - Multistage cascading transmission system of LVDS signal and LVDS signal selection switch unit

Info

Publication number: CN203278879U
Application number: CN 201220709770
Authority: CN
Inventors: 邱永刚
Original assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Current assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Priority date: 2012-12-20
Filing date: 2012-12-20
Publication date: 2013-11-06
Anticipated expiration: 2022-12-20

Abstract

The utility model discloses a multistage cascading transmission system of an LVDS signal, and the system comprises a plurality of cascading LVDS signal selection switch units. Each of the LVDS signal selection switch units comprises a plurality of LVDS signal receiving modules which are used for receiving LVDS input signals from a plurality of channels of a lower order; a controller which is used for receiving a higher order control command transmitted from a higher controller via controlling a bus, transmitting control signals of channels of selectively passed LVDS input signals at present, and correspondingly adjusting the received higher order control commands and transmitting to a lower controller; a data signal selector which is used for switching and transmitting data signals of selectively passed LVDS input signals at present according to the control signals transmitted by the controller; a clock signal selector which is used for switching and transmitting clock signals of selectively passed LVDS input signals at present according to the control signals transmitted by the controller, and transmitting the clock signals to a phase-locked loop to lock frequencies; and an LVDS signal synthesis and output module which is used for synthesizing the data signals transmitted from the data signal selector and the clock signals transmitted from the phase-locked loop to LVDS output signals, and transmitting the synthesized LVDS output signals to a higher LVDS signal selection switch unit.

Description

The multi-stage cascade transmission system of LVDS signal and diverter switch unit thereof

Technical field

The utility model relates to electronic device field, relates in particular to a kind of multi-stage cascade transmission system and diverter switch unit thereof of LVDS signal.

Background technology

For high-speed communication system, as NodeB, router, load/unload multiplexer and other equipment, adopt serial communication mode can obtain very large income.In order to guarantee that backboard communication has low error rate, low crosstalking and low radiation, common available Low Voltage Differential Signal (LVDS) substitutes the TTL signal.LVDS signal low error rate, low crosstalk and the advantage of low radiation is widely used in numeral demonstration field.

But the collecting device of LVDS is more expensive, if the cost that needs need to be to multichannel LVDS signals collecting the time is very high, therefore can't high volume applications in factory and field tests.In addition, utilize the collecting device of existing LVDS, for the limited LVDS signal of transmission range, can't gather for the LVDS signal of long-distance transmissions.

The utility model content

Many aspects of the present utility model provide a kind of multi-stage cascade transmission system and diverter switch unit thereof of LVDS signal, can realize distribution and the long-distance transmissions of LVDS, can be widely used in the collection and monitor of multichannel LVDS image.

An aspect of the present utility model provides a kind of multi-stage cascade transmission system of LVDS signal, comprises the LVDS signal shift switch unit of a plurality of cascades, and wherein, each LVDS signal shift switch unit comprises:

A plurality of LVDS signal receiving modules be used for to receive the LVDS input signal from a plurality of passages of a plurality of LVDS signal shift switch of subordinate unit;

Controller is used for receiving by control bus higher level's control command of higher controller transmission, to send the control signal of the LVDS input signal channel that current selection passes through; And will receive higher level's control command and carry out sending to subordinate's controller after correspondence is adjusted;

The data-signal selector, the control signal that sends according to controller is to switch the data-signal that transmits the LVDS input signal that current selection passes through;

Clock selector, the control signal that sends according to controller to be switching the clock signal that transmits the LVDS input signal that current selection passes through, and send to phase-locked loop to carry out Frequency Locking clock signal;

Synthetic and the output module of LVDS signal is used for clock signal that data-signal that the data-signal selector is transmitted and phase-locked loop transmit and synthesizes the LVDS output signal with the LVDS signal receiving module of the LVDS signal shift switch unit of exporting to the higher level.

As the improvement of such scheme, the LVDS signal receiving module that each LVDS signal shift switch unit comprises is four, to receive the LVDS input signal from four passages of subordinate.

A kind of LVDS signal shift switch unit of also providing on the other hand of the present utility model comprises:

A plurality of LVDS signal receiving modules are for the LVDS input signal that receives a plurality of passages;

Controller is used for sending the control signal of the LVDS input signal channel that current selection passes through;

The synthetic output module that reaches of LVDS signal is used for the data-signal of data-signal selector transmission and the clock signal of phase-locked loop transmission are synthesized the LVDS output signal with output.

As the improvement of such scheme, described LVDS signal receiving module is four, to receive the LVDS input signal of four passages.

Can recombinate to the LVDS signal in the multi-stage cascade transmission system of the disclosed LVDS signal of the utility model and diverter switch unit thereof, realize the multi-stage cascade long-distance transmission, can be widely used in the collection and monitor of multichannel LVDS image.

Description of drawings

Fig. 1 is the structural representation of the multi-stage cascade transmission system of a kind of LVDS signal in the utility model embodiment.

Fig. 2 is the structural representation of a kind of LVDS signal shift switch unit in the utility model embodiment.

How the multi-stage cascade transmission system of the LVDS signal of Fig. 1 that shown Fig. 3 a ~ 3b realizes multi-stage cascade control.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.

Referring to Fig. 1, it is the structural representation of the multi-stage cascade transmission system of a kind of LVDS signal of providing of the utility model embodiment.The multi-stage cascade transmission system of this LVDS signal comprises the LVDS signal shift switch unit 10 of a plurality of cascades, in the present embodiment, it (is that each LVDS signal shift switch unit 10 has four LVDS signal input channels that the LVDS signal shift switch unit 10 of LVDS signal shift switch unit 10 of every grade and four subordinates is connected, LVDS output signal with the LVDS signal shift switch unit 10 that receives four subordinates), and adopt cascade to switch communicaton protocol and control, for example, adopt unified control command to switch.Concrete, when all LVDS signal shift switch unit 10 of arbitrary grade receives the control command of upper level, carry out these control commands to send the control signal of switching the LVDS input signal channel that passes through when prime according to the LVDS signal shift switch unit 10 of control command corresponding selection; And will receive the LVDS signal shift switch unit 10 that higher level's control command carries out sending to after corresponding adjustment scheme of the adjustment (back describe in detail) all next stage; Equally, when the LVDS signal shift switch unit 10 of all next stage receives the control command of upper level, only there is a selected LVDS signal shift switch unit 10 that switches just can carry out this control command sending the control signal of switching the LVDS input signal channel that passes through when prime, and will receives the LVDS signal shift switch unit 10 that higher level's control command carries out sending to after corresponding adjustment scheme of the adjustment (back describe in detail) all next stage.Sending controling instruction to be gathering the LVDS signal in this way, thereby can realize nearly switching and the collection of 1024 tunnel LVDS signal.

In conjunction with Fig. 2, describe now the structure of each LVDS signal shift switch unit 10 in detail, comprise the synthetic output module 106 that reaches of a plurality of LVDS signal receiving modules 101, controller 102, data-signal selector 103, clock selector 104, phase-locked loop 105 and LVDS signal, wherein:

A plurality of LVDS signal receiving modules 101 be used for to receive the LVDS input signal from a plurality of passages of a plurality of LVDS signal shift switch of subordinate unit.In the present embodiment, each LVDS signal shift switch unit 10 comprises four LVDS signal receiving module 101a ~ 101d, to receive the LVDS input signal from four passages of subordinate.

Controller 102, the controller of the diverter switch unit by control bus and higher level, subordinate is connected, and receive by control bus higher level's control command that higher controller sends, to send the control signal (switching a LVDS input signal that receives in four LVDS signal receiving module 101a ~ 101d according to control command) of the LVDS input signal channel that current selection passes through; And will receive higher level's control command and carry out sending to subordinate's controller after correspondence is adjusted;

Data-signal selector 103, be connected with the data-signal output of described a plurality of LVDS signal receiving modules 101, and controlled by the output signal of described controller 102, and the control signal that sends according to controller is to switch the data-signal that transmits the LVDS input signal that current selection passes through;

Clock selector 104, be connected with the signal output part all the time of described a plurality of LVDS signal receiving modules 101, and controlled by the output signal of described controller 102, and the control signal that sends according to controller to be switching the clock signal that transmits the LVDS input signal that current selection passes through, and sends to phase-locked loop to carry out Frequency Locking clock signal;

Phase-locked loop 105 is connected with the output of described clock selector 104, the frequency adjustment of being correlated with the clock signal of described clock selector 104 being selected switch out; But also be connected to control the clock signal that gathers the LVDS input signal that described a plurality of LVDS signal receiving modules 101 receive with described a plurality of LVDS signal receiving modules 101.

Synthetic and the output module 106 of LVDS signal is used for clock signal that data-signal that data-signal selector 103 is transmitted and phase-locked loop 105 transmit and synthesizes the LVDS output signal with the LVDS signal receiving module of the LVDS signal shift switch unit of exporting to the higher level.

Below, in conjunction with Fig. 3 a ~ 3b, how the multi-stage cascade transmission system of describing LVDS signal of the present utility model realizes multi-stage cascade control.

As shown in Fig. 3 a, the controller of every grade adopts unified control signal to switch, and control signal adopts the Lvds signal of two-way: DATA and clock control.Wherein, clock(CLK) signal is clock signal, the DATA(data) signal must be coordinated the CLK signal could normal transmission data.The DATA signal is divided into two parts: frame head part and data division, and wherein, frame head partly is used for the confirmation of shaking hands of communication, and data division is Control the content.Every grade of controller uses the highest two gating signals as passage, then passes through the control signal adjustment, for example moves to left to issue subordinate's switch after two, control to realize multi-stage cascade, for example, the one-level order is 11000100000, and having ordered under is 000100000000.

Concrete, please refer to Fig. 3 b, when in figure, the controller of the LVDS signal shift switch unit 10a of arbitrary grade reception higher level's control command is " 1011 ... ", the highest two according to control command is that " 10 " switch the LVDS input signal that receives when the third channel of prime, and with the higher level control command is " 1011 ... " moves to left and become the controller that control command " 1100 ... " sends to the LVDS signal shift switch unit 10b1 ~ 10b4 of all next stage after two.at this time, after the controller of the LVDS signal shift switch unit 10b1 ~ 10b4 of all next stage receives this control command, only have with LVDS signal shift switch unit 10b3 that the third channel of the LVDS signal shift switch unit of upper level connects to transmit signal and just make corresponding action according to this control command, namely the highest two according to control command are that " 11 " switch the LVDS input signal that receives when the four-way of prime, and with the higher level control command is " 1100 ... " moves to left and become the controller that control command " 00xx ... " sends to the LVDS signal shift switch unit 10c1 ~ 10c4 of all next stage after two.then, after the controller of the LVDS signal shift switch unit 10c1 ~ 10c4 of all next stage receives this control command, only have with LVDS signal shift switch unit 10c4 that the four-way of the LVDS signal shift switch unit of upper level connects to transmit signal and just make corresponding action according to this control command, namely the highest two according to control command are that " 00 " switches the LVDS input signal that receives when the first passage of prime, and with the higher level control command is " 00xx ... " moves to left and become the controller that control command " xxxx ... " sends to the LVDS signal shift switch unit of all next stage after two.By that analogy, thus switch and gather multichannel LVDS picture signal.

The above is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.

Claims

1. the multi-stage cascade transmission system of a LVDS signal, is characterized in that, comprises the LVDS signal shift switch unit of a plurality of cascades, and wherein, each LVDS signal shift switch unit comprises:

Controller is used for receiving by control bus higher level's control command of higher controller transmission, to send the control signal of the LVDS input signal channel that current selection passes through; And the higher level's control command that receives is carried out sending to subordinate's controller after correspondence is adjusted;

2. the multi-stage cascade transmission system of LVDS signal as claimed in claim 1, is characterized in that, the LVDS signal receiving module that each LVDS signal shift switch unit comprises is four, to receive the LVDS input signal from four passages of subordinate.

3. a LVDS signal shift switch unit, is characterized in that, comprising:

4. LVDS signal shift switch as claimed in claim 3 unit, is characterized in that, described LVDS signal receiving module is four, to receive the LVDS input signal of four passages.